The Atomic Mass (Mass Number) of an Atom Is Determined

question 31

Multiple Choice

The atomic mass (mass number) of an atom is determined by the combined masses of its

• A) neutrons and protons.
• B) neutrons and electrons.
• C) protons and electrons.
• D) protons, neutrons, and electrons.
• E) neutrons, nucleus, and electrons.

---

Definitions:

Placental Mammals

Mammals that give birth to live, fully developed young that have been nourished in the womb via a placenta.

Marsupial Mammals

A group of mammals characterized by giving birth to relatively undeveloped offspring which typically continue to develop in a pouch on the mother's body.

Uterus

The reproductive organ in female mammals where fertilized eggs implant and develop into a fetus.

CitT Gene

A gene encoding a protein that facilitates the transport of citrate across cell membranes, often studied in bacterial species.